PKMAS and Zeno Walkway System ProtoKinetics LLC
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Transcript PKMAS and Zeno Walkway System ProtoKinetics LLC
PKMAS and Zeno Walkway
System
ProtoKinetics LLC
Michael Rowling
Kristen Larsen
www.protokinetics.com
Zeno Hardware
• Technical Specifications
16 levels of dynamic pressure
0.4’’ square sensors on 0.5’’ centers over sensing array
Dual control sensing elements avert false firing
•Three Layer Walkway (0.5’’ height)
Base Layer:
-Flexible linoleum with sloped rubber edging facilitates
smooth transitions onto walkway
Middle Layer:
-Protects sensing technology and circuitry
-Reduces curling of the edges
Top Cover:
-Carpet or flexible linoleum with a variety of patterns
-Velcro edge lining secures layers
•Customization: match your lab and research needs
Top cover Pattern
Size
8’
12’
2’
4’
x
x
14’
16’
20’
26’
x
x
x
x
x
Zeno Walkway Setup
•The 2x16 Zeno
mat ships in two
boxes.
•To setup, first roll
out the base layer.
Then, roll the
sensing carpet out
with its circuitry
fitting into the
base. Complete
the walkway by
securing the top
cover in place with
its Velcro edges.
• To record a walk,
use the Zeno box
to connect the
walkway to the
USB port of the
computer with
PKMAS software
installed.
Powered by PKMAS Software
•Data collection, processing, and analysis software for:
Zeno Walkway
GAITRite platinum series
•Encryption key for data security
•Multiple pass trials
•Minimum volume ellipse bounded footprints
•114 primary and computed gait parameters
COP, COMe, step/stride length, foot area, Coefficient of Variation, Left/Right Ratio,
cadence, Toe In/Out angle, Path Efficiency
•Export gait measurements
•Develop Custom Protocols
Walking (with or without dual tasking), TUG, Figure 8’s, FSST, 360° turns, Fukuda Step
Test, side stepping, unilateral and bilateral stability
Syncing
•Push-button switch
User marks change of event during
recording for quick referencing
during analysis
Binary square pulse
•Zeno Interactive Module
Use with PKMAS for lights and
tones
Built-in random delay features
Ideal for gait initiation
•Wireless XBEE input
Inclinometer Devices
Cup & Tray Dual Tasking
Track upper body movement( X, Y)
•Internal Metronome
40 BPM-208 BPM
•Sync Output (3.5mm Stereo Jack)
TTL Pulse
•Logitech Video Camera
1-2 cameras
Synchronized video and footfalls
PKMAS Angles
•Projection Angle of Stride
Vector from heel of one foot to consecutive heel of the same foot (degrees)
Useful in non-linear walking to describe movement direction at any point in time
PKMAS step length considers direction of progression for optimal measurement accuracy
•Minimum Volume Bounding Ellipse
Computes ellipse with the smallest area that wholly encloses all sensors of a footfall
Ellipse’s major axis used to determine foot placement angle
Reliable over gait patterns with anomalies
Ellipse theory considers the shape of entire footfall
incomplete and asymmetric footfalls will display less error than competitive techniques
Center of Mass Estimated
• Exclusive COMe algorithm based on velocity and direction of pressure sensor activation
• Algorithm tested in varying conditions against state of the art motion capture systems at two
major US research institutions
COM data (red) plotted against PKMAS COMe calculation (green).
Gait Measurements
•Display Gait Measurements table in
PKMAS for statistical and step by step
quantitative values
•Easily navigate from any footfall
measure to the first or last contact
time on walkway
•Measures include:
Toe/Heel Location
Foot length, width, area
Step/stride time, length, width
Stance, swing, gait cycle
Stance, swing, single/double
support percent
Velocity, cadence
Foot angle, direction of
progression
Left to Right Ratios
Exporting to Excel
• Export directly from Gait Measurement table to effortlessly create plots
•Graphing the
Left/Right Ratio
provides a
meaningful
depiction of
asymmetrical
variables
The ProtoKinetics Advantage
•PKMAS Platform
Advanced and Accurate Measurements
Verified, Validated and Certified
Capable of processing many walk files that competitors cannot
User-friendly, Precise Documentation
Continuous software growth
Excellent Technical support
•Testing Protocols
Incorporate new measurements
Certifications
Multiple passes and turning trials
ISO 13485:2003
Zeno Interactive Module
CE Marked
•Zeno Walkway
16 levels of pressure
Protected sensing technology
Available in 2’ and 4’ widths
Verified, Validated and Certified